Combined center and cannon pinion



w. w. JORDAN COMBINED CENTER AND CANNON PINION.

APPLICATKON FILED JAN-7,1918.

1,327,392, Patented Jan. 6,1920.

WILLIAM W. JORDAN, OF DELHI, LOUISIANA.

COMBINED CENTER AND CANNON PINION.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application filed January 7, 1918. Serial No. 210,725.

To all whom it may concern:

Be it known that I, WILLIAM W. JORDAN, a citizen of the United States, residing at Delhi, in the county of Richland and State of Louisiana, have invented certain new and useful Improvements in Combined Center and Cannon Pinions, of which the following is a specification.

This invention relates to improvements in watches and has for its object to provide an improved arbor and cannon pinion construction by means of which it is impossible for the cannon pinion to slip or work loose at any period of the life of the watch, thus insuring a more accurate and reliable time piece.

Another object of the invention is to provide a center pinion for watches that may readily be removed without taking the watch movement apart.

A still further object of the invention is to provide a center arbor for watches so constructed as to have a spring tension upon its cannon pinion.

With the above and other objects in view I have invented the device illustrated in the accompanying drawings in which The figureis a greatly enlarged sectional elevat'ional view of certain parts of a watch movement embodying my invention.

Like reference characters indicate like parts throughout the following specification and in the drawing in which 1 and 2 indicate the top and bottom plates respectively of a watch movement, 3 isthe center wheel having a square opening 4 therethrough, 5 is the center arbor or shaft and 6 the cannon pinion. The upper end 7 of the arbor 5 is tapered to fit the tapered bore 8 of the cannon pinion and said upper end is split as at 9 and is confined under tension in said bore 8 whereby there is positive frictional engagement between the arbor 5 and pinion 6. The bore 8 is slightly counter sunk at 10 to receive the flared head 11 of the center shaft 5, the frictional engagement between the arbor 5 and pinion 6 beginning at the flange 12 of said head. It is obvious that as the engaging surfaces of the center shaft 5 and cannon pinion wear, the parts 13 and 14 of the center shaft will spread apart and take up any space which would otherwise be created between said shaft 5 and pinion 6, thus maintaining a positive frictional lock between the parts at all times.

The shank 15 of the center shaft is squared to fit the square opening 4: of the center wheel, whereby positive engagement of these members is assured. In order to remove the center shaft for cleaning or repairing, all that is necessary is to take off the nut 16 from its lower end 17 whereupon the cannon pinion and center shaft may be lifted out together without taking the works apart otherwlse.

I do not limit my invention to the specific construction shown and described herein as it is deemed unnecessary to show but one embodiment 'of the general idea, but that which I do claim as new and desire to procure by Letters Patent is In a device of the character described, the combination with side plates having alined Eopenings of which one is smaller than the other, an arbor journaled within the openings and insertible through the larger opening, the portion of the arbor between the plates having a polygonal formation, a center pinion fitted slidably upon the polygonal portion of the arbor, one end of the arbor projecting beyond the plates, means for locking the arbor against removal, and a cannon pinion fitted upon the projecting end of the arbor. In testimony whereof I afiix my signature in the presence of two witnesses. 7 WILLIAM W. JORDAN; Witnesses:

T. C. spams, C. H. RUNDELL. 

